Maharishi Vedic Science

"Through centuries of observing both cosmic and human behavior, ancient ayurvedic healers defined three basic gunas or qualities that influence everything that happens in the macrocosm of the universe or the microcosm of our minds. It's the quantity of these three gunas — Sattva, Rajas and Tamas — that ayurvedic healers believed can create or destroy harmony in our lives:
"Sattva is the most superior of all gunas. Sattva in the universe is responsible for creation. Inside our own self, it gives us the ability to visualize well, think right, do good and act in accordance with the laws of nature."
-- See more at: http://www.mapi.com/ayurvedic-knowledge/brain-power/creating-a-balanced-mind.html#gsc.tab=0